Enhancing the magnification of the Diamondback 8.5x50 is only a plus with this quality pair of Diamondback binoculars. Like the Diamondback 8.5x50s, the 10x50 is a rugged roof prism binocular. The waterproof, dustproof and internally fogproof design features an internal focusing mechanism, O-rings at all open points and nitrogen purging. Argon gas purging protects your Diamondback binocular in the following ways...1) Argon gas does not absorb or react chemically with water. 2) Argon gas eliminates internal fogging. 3) Argon gas maintains its protective properties over a wider temperature range. 4) Argon gas does not diffuse as quickly as other elements, extending the service life of the optics longer. Fully multi-coated optics increase light transmission for higher image quality in all lighting conditions - enhanced for 2009. BaK-4 prisms provide sharp images from one edge of the broad viewing field to the other. Phase corrected prisms (increasing light transmission by 7%) deliver sharp, greatly contrasted images.
